Actually, to be precise, "chink" refers to any Mongoloid citizen of any country in the world who can trace his/her ancestry back to ancestors who were born and brought up in Mainland China before the ROC or PRC existed, so let's say Qing-dynasty China (or preferably Ming dynasty! :p).
Therefore, "chinks" nowadays consist of Mongoloid human beings of many different nationalities: wikipedia.org/wiki/Overseas_Chinese
plus citizens of the PRC and ROC.